Optical isolator device

Details Optical isolator device Optical isolator device

1993-01-22

1998-11-10

Epps, Georgia Y.

Optical: systems and elements

Polarization without modulation

Polarization using a time invariant electric, magnetic, or...

359281, 359282, 359283, G02B 530

Patent

active

058352708

ABSTRACT:
An optical isolator device is provided which is free from polarization dispersion. The optical isolator device presents an optical path which is equidistant for both an ordinary ray and an extraordinary ray. The optical isolator device of the present invention comprises a first and second optical isolator, each of identical thickness and each comprising a birefringent for separating an ordinary ray and an extraordinary ray, a polarization rotator for rotating the plane of polarization of these rays and a birefringent for continuing the ordinary ray and the extraordinary ray. In an embodiment of the present invention, an optical isolator device comprises two optical isolators in series, each comprising a first birefringent element for separating an input beam into an ordinary ray and an extraordinary ray, a polarization rotor for rotating the planes of polarization of the ordinary and extraordinary rays by (2m .+-.1/2).times.90 degrees (m being an integer), and a second birefringent element for combining the extraordinary ray with the ordinary ray.

REFERENCES:
patent: 3267804 (1966-08-01), Dillon, Jr.
patent: 4464022 (1984-08-01), Emkey
patent: 4712880 (1987-12-01), Shirasaki
patent: 4974944 (1990-12-01), Chang
patent: 5204771 (1993-04-01), Koga
The Institute of Electronics, Information and Communication Engineers, Tokyo Japan 1991 Spring National Convention Record (Mar. 26-29, 1991) 4-125; Fujita et al.:"A polarization-independent optical isolator with fiber pigtails".
Patent Abstracts of Japan, vol. 9, No. 291 (E-359) Nov. 19, 1985.
European Search Report EP 93 10 0926.

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